Plant Growth and Development, How Plant Hormones and Tropisms Regulate

Plant hormones and tropisms regulate plant growth and development through chemical reactions and external stimuli which influence the functioning of plant cells. Plant hormones (e.g. Abscisic Acid, Auxins, Cytokinins, Ethylene, Gibberellins) in very small concentrations, can encourage a range of actions (depending on the specific hormone) including cell division, cell elongation, drought resistance, cold resistance, and seed germination. Plant tropisms (see entry for this term) are the external stimuli to which a plant responds, either positively or negatively, utilising hormones to control the extent of response made. The interaction of hormones and tropisms, working in tandem are a crucial element in ensuring the production well-developed plant.